Fist you have to find the volume which is 24 x 18 x 5= 2160 feet. Then the dump truck can only take 8 cubic yards so then you have to make the 2160 feet into yards. There are 3 feet in one yard so 2160/3=720 so now there are 720 yards and since the dump truck can only take 8 yards a trip then it would take 90 trips/dumps to empty out the area for the pool. 720/8=90 Hope this helps
